Astronomy and Astrophysics – Astrophysics
Scientific paper
2003-12-19
Astronomy and Astrophysics
Astrophysics
12 pp, invited review at Princeton meeting on "AGN Physics with the Sloan Digital Sky Survey" (July 2003), ed. G. T. Richards
Scientific paper
The paradigm for AGN unification is reviewed, in terms of its optical manifestation as obscuration in the equatorial plane and its radio manifestation as relativistic beaming of the jet emission. Within this paradigm, observed AGN properties depend strongly on orientation angle. The predictions of unification are commensurate with the local numbers of AGN of various types. The outstanding question concerns a possible population of obscured AGN at high redshift, which are thought to produce the X-ray background, although few are observed directly. We describe early results from GOODS, an HST-SIRTF-Chandra multiwavelength survey, which has as one of its principal goals the search for such obscured AGN.
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